Added test functionality (getting list of bundles with translations).

grails-app/services/by/prominence/translations/BundleService.groovy

@@ -0,0 +1,49 @@
+package by.prominence.translations
+
+class BundleService {
+
+    private HashSet<Bundle> cachedBundles
+
+    private static final defaultFolder = "i18n"
+
+    HashSet<Bundle> getBundles(boolean noCache = false) {
+        if (!cachedBundles || noCache) {
+            cachedBundles = searchForBundles().values()
+        }
+        return cachedBundles
+    }
+
+    private Map<String, Bundle> searchForBundles() {
+        Map<String, Bundle> result = new HashMap<>()
+
+        new File('.').eachFileRecurse() { File file ->
+            if(file.name.endsWith('.properties')) {
+                if (isTranslationProperty(file)) {
+
+                    String bundleName = getBundleName(file.name)
+                    if (!result.get(bundleName)) {
+                        Bundle bundle = new Bundle(name: bundleName)
+                        result.put(bundleName, bundle)
+                    }
+                    result.get(bundleName).addPropertyFile(file)
+                }
+            }
+        }
+
+        return result
+    }
+
+    private boolean isTranslationProperty(File file) {
+        return file.parent.contains(defaultFolder)
+    }
+
+    private String getFileNameWithoutExtension(String filename) {
+        return filename.substring(0, filename.lastIndexOf('.'))
+    }
+
+    private String getBundleName(String filename) {
+        return filename.indexOf('_') < 0 ?
+                getFileNameWithoutExtension(filename) :
+                filename.substring(0, filename.indexOf('_'))
+    }
+}